Zepto- Definition
zeptō, zeptə
prefix
One sextillionth (10−21 ).
Zeptosecond.
American Heritage
affix
One sextillionth part of; the factor 10-21
Zeptosecond.
Webster's New World
Origin of Zepto-
-
From alteration of Latin septem seven (from its representing the seventh power of a thousandth) septet
From American Heritage Dictionary of the English Language, 5th Edition
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